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Cushion|Lab Grown|IGI

1.64ct E SI1 Cushion Lab Grown Diamond

ID • E/SI1 • IGI LG516259346

Shape and cutting style on the report: Square cushion brilliant

Certificate IGI LG516259346

Diamond specifications and retailer prices

From $598 AUD
$420 USD
As of October 28, 2026
Save $1,332 AUD (69%) vs most expensive(unlock to see where)
7 retailers carry this diamond
Most expensive: $1,930 AUD at Reve Diamonds · As of October 25, 2026
View at Reve Diamonds

About this 1.64ct lab-grown cushion diamond

This 1.64ct lab-grown cushion sits in the one-and-a-half to two carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG516259346 or 516259346. Listed at 7 retailers as of October 25, 2026, with prices from $598 to $1,930, a $1,332 spread on the same certified stone. Reve Diamonds lists it at $1,930. SI-grade stones are eye-clean roughly 60 to 70% of the time at this carat range. Check the inclusion plot on the cert and ask the retailer for high-resolution video before buying.

The 4Cs

1.64
Carat
E
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.5°
Pavilion angle35.7°
OriginLab Grown
Grading LabIGI
CertificateIGI LG516259346
Dimensions7.64 × 6.44 × 4.38 mm
L/W Ratio1.19
Girdle conditionFaceted
Culet sizePointed
Cert comments
As Grown - No indication of post-growth treatment This Laboratory Grown Diamond was created by High Pressure High Temperature (HPHT) growth process Type II
Top View
7.64 mm6.44 mm1.64 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG516259346
Side View
Table 60.5%Crown 35.5°Girdle: MED-STKPavilion 35.7°Culet: NoneDepth 64.8%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 28
Current: $838 AUD|Low: $399 AUD|High: $1,930 AUD|Avg: $975 AUD|+3.9%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Reve Diamonds
October 27, 2026
Retailer 4$399 AUD
Retailer 3$598 AUD
Retailer 6$767 AUD
Retailer 5$769 AUD
Retailer 1$838 AUD
Retailer 2$1,777 AUD
Reve Diamonds$1,930 AUD

27 data points across 7 retailers

7 retailers$598 AUD to $1,930 AUD

B+
Cheapest Retailer
-
$598 AUD
$420 USD
A
Retailer 2
-
$767 AUD
$539 USD
View
A
Retailer 3
-
$769 AUD
$540 USD
View
A
Retailer 4
-
$838 AUD
£463 GBP
View
B
Retailer 5
-
$1,497 AUD
$1,052 USD
View
B
Retailer 6
-
$1,777 AUD
£983 GBP
View
Most Expensive
B
Reve Diamonds
5D6636B77 · Oct 25
$1,930 AUD
$1,356 USD
View
6 more retailers have this diamond
Prices start from $598 AUDSave up to $1,332 AUD

Carat Hunter is not affiliated with, endorsed by, or sponsored by any retailer listed. Retailer information is from publicly available sources and may not be current. Verify details directly with the retailer before purchasing. Return terms as we hold them. Check the retailer's own returns page before you buy.

A
1.64ct Cushion
$598 AUD